OmniSim

Surface Grating Coupler Design Utility

Automatic design of surface grating couplers with OmniSim

OmniSim's Surface Grating Coupler Design Utility allows you to design and optimise surface grating couplers (chip to fiber couplers) automatically, in both 2D and 3D.

Generating 2D Grating Profiles

You only need to specify your epitaxial structure, your wavelength and the properties of your output beam (size and tilt angle) and OmniSim will automatically generate 2D grating profiles with routines for finding the best effiency, with a choice of periodic or apodised geometry.

An apodized 2D grating profile in silicon on insulator

The efficiency of the profiles can be calculated with all three of OmniSim's 2D FDTD, 2D FETD and 2D FEFD engines, allowing you to calculate the efficiency with confidence and high precision. The utility automatically calculates the coupling efficiency by performing an overlap with the tilted Gaussian beam profile.

Live visualisation of the emitted field during the FDTD calculation

Optimising 3D Grating Layouts

The Surface Grating Coupler Design Utility can also generate the 3D layout of the grating and calculate their efficiency.

Top view of the 3D structure for a collimated periodic grating

For tapered gratings it will automatically generate the curvature of the grating lines based on the taper geometry. This is done by detecting the curvature of the phasefront along the taper and applying it to the design.

Top view of the 3D structure for a tapered (curved) apodized grating

The 3D efficiency of the gratings can be calculated with all OmniSim's 3D FDTD and 3D FETD engines. The utility automatically calculates the coupling efficiency by performing an overlap with the 2D tilted Gaussian beam profile.